Soy Sauce (Best Option)
1/2 teaspoon per 2 eggsSoy sauce contains glutamates similar to fish sauce, which provide the savory umami flavor that complements scrambled eggs. Its liquid form integrates well without altering the eggs' texture.
When using soy sauce, start with a small amount and adjust to taste, as it can be saltier than fish sauce. Low-sodium versions help control salt levels and prevent the eggs from becoming too dark.
Compared to fish sauce, soy sauce has a milder fishiness and a slightly different aroma, but it maintains the savory depth that enriches scrambled eggs, making it the closest and most reliable substitute.